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A validated asymptotic thermomechanical model for air-gap formation in tapered moulds in the continuous casting of steel

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posted on 2021-06-24, 14:37 authored by M. Devine, Michael Vynnycky, Sarah L. Mitchell, Stephen B.G. O'Brien
A recent asymptotics-based thermomechanical model is adapted and applied to the mould region in the continuous casting of round steel billets, with a view to describing the complex interplay between airgap formation, mould taper, cooling channel width and cooling water velocity. Although the situation is steady state, the analysis leads to what is mathematically a dual moving-boundary problem for the solid–melt and solid–air interfaces, where the distance from the top of the mould region is the time-like variable in the problem. Moreover, the two interfaces are initiated at different locations. In addition, the thermal and mechanical problems are found to decouple and it is possible to solve the first ahead of the second. The model equations are solved numerically using a finite-difference method, and the approach is subsequently successfully validated against a previous finite-element model and experimental data from temperature measurements taken within the mould.

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Publication

IMA Journal of Applied Mathematics;86, pp. 349-377

Publisher

Institute of Mathematics and its Applications: Oxford University Press

Note

peer-reviewed

Other Funding information

SFI, IRC

Language

English

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